Uast: Fix for missing local variables in ctor-s bodies

similar to how it is done in `KotlinUBlockExpression`

plugins/uast-kotlin/testData/Constructors.kt

@@ -67,6 +67,8 @@ class AWithSecondaryInit {
 
     constructor(s: String) {
         a = s
+        var local: String = s
+        local.toString()
     }
 
 }

plugins/uast-kotlin/testData/Constructors.log.txt

@@ -151,3 +151,11 @@ UFile (package = )
                 UBinaryExpression (operator = =)
                     USimpleNameReferenceExpression (identifier = a)
                     USimpleNameReferenceExpression (identifier = s)
+                UDeclarationsExpression
+                    ULocalVariable (name = local)
+                        USimpleNameReferenceExpression (identifier = s)
+                UQualifiedReferenceExpression
+                    USimpleNameReferenceExpression (identifier = local)
+                    UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
+                        UIdentifier (Identifier (toString))
+                        USimpleNameReferenceExpression (identifier = toString)

plugins/uast-kotlin/testData/Constructors.render.txt

@@ -75,5 +75,7 @@ public final class AWithSecondaryInit {
     public fun AWithSecondaryInit(@org.jetbrains.annotations.NotNull s: java.lang.String) {
         <init>()
         a = s
+        var local: java.lang.String = s
+        local.toString()
     }
 }